Re: What is the "sign of life"?



meow2222@xxxxxxxxx wrote:

Pooh Bear wrote:
Spehro Pefhany wrote:
On Wed, 14 Jun 2006 16:38:25 +0100, the renowned Pooh Bear
<rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:

If you wanted to be cute and the micro has an onboard dac, you could monitor the
battery voltage and flash a bi-colour led green when the battery is good and red
when the battery voltage is low.

Graham

Or (cheaper) change the duty cycle or frequency of a single LED
depending on battery condition. I'm not sure where the DAC would come
in. Some micros have a comparator and absolute reference so you
wouldn't necessarily even need an ADC for go/no-go indication.

Ooops. Typo. I did mean ADC but a comparator and reference would be fine too. Mind
you, with the ADC you could change the led from green to red via yellow too if you
liked !

Graham

You can do that with a ref and comparator too, just by adding a little
ac or noise onto the reference line. Micros always have sources of that
around.

Yes that would work too. What a source of bright ideas we are ! Boki, we expect this
feature on your next product !

Graham

.

Relevant Pages

  • Re: What is the "sign of life"?
    ... battery voltage and flash a bi-colour led green when the battery is good and red ... I did mean ADC but a comparator and reference would be fine too. ...
    (sci.electronics.design)
  • Re: Battery type for calibration reference
    ... My question has to do with how to provide a voltage calibration ... ability to get a single reference point. ... what is the relative ranking of battery voltage accuracies? ...
    (sci.electronics.basics)
  • Re: atmega16 adc question
    ... > I'm working on a project using an Atmega16 mcu. ... > measure the battery voltage via a divider. ... > to the adc pin before the switching power supply brings the mcu up. ...
    (sci.electronics.design)
  • Re: P-channel Mosfet switch?
    ... I do have a question if I do use comparators to switch the FETS. ... using an LTC1440 to monitor the battery voltage and if it drops to ... And the comparator will give the correct output as long as at least ...
    (sci.electronics.basics)
  • Re: P-channel Mosfet switch?
    ... I do have a question if I do use comparators to switch the FETS. ... using an LTC1440 to monitor the battery voltage and if it drops to ... And the comparator will give the correct output as long as at least ...
    (sci.electronics.basics)